code: def test_bit_count(self):
      for exp in [10, 17, 63]:
          a = 2**exp
          assert np.uint64(a).bit_count() == 1
          assert np.uint64(a - 1).bit_count() == exp
          assert np.uint64(a ^ 63).bit_count() == 7
          assert np.uint64((a - 1) ^ 510).bit_count() == exp - 8
  
imports: import fractions
  import platform
  import types
  from typing import Any, Type
  import pytest
  import numpy
  from numpy._core import sctypes
  from numpy.testing import assert_equal, assert_raises, IS_MUSL
label_desc: Use image node_id 2 for calling the TestBitCount obj's underlying member method code with example usage: obj.test_bit_count() without return types